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10 most difficult calendar riddles

A list of calendar related questions that are most often answered incorrectly
Mathematics quiz
Augustus was born on 1 January 10BC. Which birthday did he celebrate at 1 January 10AD?
19
20
21
80
There was no year number zero. There were only 1999 years between 1000BC and 1000AD.
Gizem İsmailoğlu
Correct this question
0
Correct this question
5
Very interesting!
math riddles
If there is Friday 13th in a month, then ...
this month has 30 or 31 days
this month starts on Sunday
this month ends on Sunday
All of the answers are correct
If 1st is Sunday then Friday is on 6th and 13th.
lukasz Poland
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0
Correct this question
1
Very interesting!
legends riddles
How many times in a year may Friday 13th happen?
up to 2
up to 3
up to 4
up to 5
Friday 13th happens three times in a year only if it starts on Thursday or (leap year) on Sunday.
lukasz Poland
Correct this question
0
Correct this question
1
Very interesting!
symbols riddles
How many months have 31 days in them?
5
6
7
8
January, March, May, July, August, October and December.
Kasia
Correct this question
0
Correct this question
0
Very interesting!
mathematics riddles
Which day was the last of the 20th century?
31 Dec 1999
31 Dec 2000
31 Dec 2001
31 Dec 1899
There was no year number zero. So, the first century started on 1 Jan 1. Similarly, 21th century started 1 Jan 2001.
Jason Beagley
Correct this question
0
Correct this question
3
Very interesting!
maths riddles
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